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Quick Answer. It takes 9 to 10 hours to cook a 3-pound beef top round roast in a Crock-Pot at the low setting. The roast only requires about 5 hours of cooking time at the high setting, but this tough cut of meat isn't recommended for cooking on the high setting. The faster cook time and higher temperature doesn't break down the tough meat fibers and leaves the roast tough.
I have a 3 pound tri tip sirloin from Costco and the directions say to cook it in a 425 degree oven until an internal temp of 140, but I don't have a meat thermometer, but even if I did have one, it would have been convenient to know the apprx cooking time.ear the meat in the roasting pan on top of the stove then finish roasting in a 425 degree oven for about 45 minutes. Let the roast rest for 15 minutes before slicing to allow the juices to redistribute and for an evenly cooked roast.